release: bump to 0.0.5

Since v0.0.4: or-patterns over active-pattern cases + structural arms
in AP matches (exhaustive without `_` for total case sets), and the
persistent-process REPL (definitions run once at entry, `let mut`
state persists across entries).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: simontreanor

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "pyfun"
-version = "0.0.4"
+version = "0.0.5"
 edition = "2024"
 rust-version = "1.96"
 description = "An F#-inspired, functional-first language that compiles to readable Python."